Tractor



FIG. 1 is a front elevational view of a tractor, showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a perspective view thereof;

FIG. 7 is another perspective view thereof; and,

FIG. 8 is another perspective view thereof.

The broken lines indicate structure that is for illustrative purposesonly and form no part of the claimed design.

We claim the ornamental design for a tractor, as shown and described.